This family includes outer membrane protein W (OmpW) proteins from a variety of bacterial species. This protein may form the receptor for S4 colicins in E. coli [1].

1: Characterization of colicin S4 and its receptor, OmpW, a minor protein of the Escherichia coli outer membrane. Pilsl H, Smajs D, Braun V; J Bacteriol 1999;181:3578-3581. PMID:10348872

2: Nucleotide sequence of the gene, ompW, encoding a 22kDa immunogenic outer membrane protein of Vibrio cholerae. Jalajakumari MB, Manning PA; Nucleic Acids Res 1990;18:2180-2180. PMID:2336399